A-LevelPhysicsElectricity9702/12 · May/June 2017 · Q341 Mark

Two wires have the same length and the same resistance. Wire X is made of a metal of resistivity 1.7 × 10⁻⁸ Ωm and wire Y is made of a metal of resistivity 5.6 × 10⁻⁸ Ωm. The diameter of wire X is 0.315 mm. What is the diameter of wire Y?

A0.17 mm

B0.33 mm

C0.57 mm

D1.0 mm

✓ Correct answer

C: 0.57 mm

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2017 Paper 1 Variant 2, question 34.

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